diff --git a/include/Interpreter.h b/include/Interpreter.h
index c3a3329..9298a99 100644
--- a/include/Interpreter.h
+++ b/include/Interpreter.h
@@ -60,7 +60,7 @@ class Interpreter {
 
   bool checkCompatibility(Token *op, Object left, Object right) {
     if ((left.type == string_type && right.type == num_type) ||
-        right.type == num_type && left.type == string_type) {
+        left.type == num_type && right.type == string_type) {
       return true;
     } else {
       return false;
diff --git a/main.cpp b/main.cpp
index e11f6f0..d082021 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,4 +1,3 @@
-#include "AstPrinter.h"
 #include "Error.h"
 #include "Interpreter.h"
 #include "Scanner.h"
diff --git a/test/TestInterpreter.cpp b/test/TestInterpreter.cpp
index 9529a5d..ea5fce1 100644
--- a/test/TestInterpreter.cpp
+++ b/test/TestInterpreter.cpp
@@ -65,6 +65,5 @@ TEST(IntrepreterTest, TestStringNumExpressions) {
   Expr *expression2 = p2.parse();
 
   ASSERT_EQ(Interpreter{}.interpret(expression1), "test8.000000");
-  // todo: test not passing ASSERT_EQ(Interpreter{}.interpret(expression2),
-  // "8.000000test");
+  ASSERT_EQ(Interpreter{}.interpret(expression2), "8.000000test");
 }